US7677353B2 - Noise suppression structure - Google Patents
Noise suppression structure Download PDFInfo
- Publication number
- US7677353B2 US7677353B2 US12/193,310 US19331008A US7677353B2 US 7677353 B2 US7677353 B2 US 7677353B2 US 19331008 A US19331008 A US 19331008A US 7677353 B2 US7677353 B2 US 7677353B2
- Authority
- US
- United States
- Prior art keywords
- sound
- speaker
- absorption sheet
- sound absorption
- speaker grille
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000001629 suppression Effects 0.000 title claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 58
- 239000004745 nonwoven fabric Substances 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 239000002759 woven fabric Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 8
- 239000011800 void material Substances 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000013056 hazardous product Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000000383 hazardous chemical Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to a noise suppression structure for preventing noise such as friction sound and reverberation caused when sound from a speaker vibrates a speaker grille.
- a recess 2 a for fitting a speaker grille 4 is formed in a position corresponding to a speaker opening 2 in an interior trim 1 (the position where the speaker grille 4 is attached), as shown in FIG. 4 .
- the speaker opening 2 is opened in the recess 2 a
- a speaker 3 is disposed in the speaker opening 2 .
- the speaker grille 4 is fitted in the recess 2 a so as to cover the speaker opening 2 .
- the speaker grille 4 is provided to protect the speaker 3 from an external shock and improve the appearance.
- the sound from the speaker 3 passes through sound holes 5 which are formed in a ceiling board 4 a of the speaker grille 4 .
- a flange 4 b is formed in the periphery of the ceiling board 4 a of the speaker grille 4 .
- the speaker grille 4 can be detachably attached to the interior trim 1 by engaging hooks 8 provided at the end of the flange 4 b with engaging holes la opened in the interior trim 1 .
- a cylindrical-shaped sound guiding tube 6 for carrying sound from the speaker 3 to the sound holes 5 efficiently is extended downward from the ceiling board 4 a of the speaker grille 4 .
- the speaker grille 4 is detachably attached to the interior trim 1 for maintenance of the speaker 3 .
- the sound from the speaker 3 passes through the sound guiding tube 6 and the sound holes 5 of the speaker grille 4 and reaches the ears of a passenger.
- the sound from the speaker 3 also vibrates the speaker grille 4 .
- the speaker grille 4 when the speaker grille 4 vibrates, friction sound may be generated at contact parts between the speaker grille 4 and the interior trim 1 (specifically, each of retaining pars K 1 between the engaging holes 1 a and the hooks, contact part between an outer face K 2 of the flange 4 b and the interior trim 1 and contact part between a lower edge K 3 of the flange 4 b and the interior trim 1 ).
- the friction sound is a noise offensive to the ear.
- non-woven fabric 7 is adhered to the contact parts of the speaker grille 4 , the retaining part K 1 , the outer face K 2 of the flange 4 b , and the lower edge K 3 .
- adhesive material is provided on the back side of the non-woven fabric 7 . With the adhesive material, the non-woven fabric 7 is adhered to the speaker grille 4 ).
- the adhesive material provided on the back side of the non-woven fabric 7 contains a hazardous material such as VOC (Volatile Organic Compound).
- VOC Volatile Organic Compound
- An object of the present invention is to provide a noise suppression structure which can be easily and reliably assembled, eliminating the influence of hazardous material such as VOC and, moreover, preventing noise such as frictional sound and reverberation due to vibration of a speaker grille.
- a noise suppression structure 10 has;
- an interior trim 12 having an opening for speaker 20 and engaging holes 22 opened around the opening for speaker 20 ;
- a speaker grille 14 attached to the interior trim 12 so as to close the speaker opening 20 , including a ceiling board 14 a having sound holes 24 allowing passage of sound from the speaker 18 , a flange 14 b extended downward from outer periphery of the ceiling board 14 a , a sound guiding tube 32 extended downward from the ceiling board 14 a so as to surround the speaker 18 , and hooks 30 that engage with the engaging holes 22 ; and
- a sound absorption sheet 16 pinched between the flange 14 b of the speaker grille 14 and the interior trim 12 except portions between the hooks 30 and the engage holes 22 , having a sound guiding tube insertion hole 34 allowing insertion of the sound guiding tube 32 , and covering an opening of a space X formed with the flange 14 b and the sound guiding tube 32 .
- the sound absorption sheet 16 is pinched between the flange 14 b of the speaker grille 14 and the interior trim 12 . Consequently, even when the speaker grille 14 vibrates with the sound from the speaker 18 , the vibration is absorbed by the sound absorption sheet 16 at the pinched portion, and no friction noise is generated.
- the hooks 30 are engaged/contacted directly with the engaging holes 22 . However, since there are no allowances in each of the engagement portions between the hooks 30 and the engaging holes 22 by pinching the sound absorption sheet 16 with sufficient elasticity. Consequently, the generation of friction sound at these portions is largely reduced.
- the sound absorption sheet 16 contacts with the speaker grille 14 around the hooks 30 and is pinched between the speaker grille 14 and the interior trim 12 .
- the friction sound which generated even slightly is absorbed by the sound absorption sheet 16 and is reduced to inaudible sound.
- Reverberation transmitted to the space X between the flange 14 b of the speaker grille 14 and the sound guiding tube 32 i.e. vibration sound generated by vibrating the speaker grille 14 and transmitted into the space X
- the sound absorption sheet 16 covering the opening of the space X Consequently, reverberation which causes another type of noise is not generated in the space X.
- the noise suppression structure 10 can be reliably assembled with the simple work that covering the opening in the space X between the flange 14 b of the speaker grille 14 and the sound guiding tube 32 with the sound absorption sheet 16 and attaching the speaker grille 14 in which the opening in the space X is covered with the sound absorption sheet 16 to the interior trim 12 .
- work variations among workers do not occur.
- the adhesive material conventionally used for attaching the sound absorption sheet 16 is not necessary.
- hazardous materials such as VOC are not diffused in a vehicle compartment.
- the sound absorption sheet 16 may be made of woven fabric or non-woven fabric.
- the noise suppression structure which can be easily and reliably assembled, eliminate the influence of a hazardous material such as VOC and, moreover, prevent generation of noise such as friction sound and reverberation generated by vibration of the speaker grille can be obtained.
- FIG. 1 is an exploded perspective view showing noise suppression structure for a speaker as an embodiment of the invention.
- FIG. 2 is an exploded cross section showing the noise suppression structure for a speaker as the embodiment of the invention.
- FIG. 3 is a cross section of the noise suppression structure for a speaker as the embodiment of the invention.
- FIG. 4 is a cross section showing a conventional noise suppression structure.
- the noise suppression structure 10 is to prevent noise offensive to the ear such as friction sound and reverberation caused when sound from a speaker vibrates a speaker grille 14 .
- the noise suppression structure 10 is constructed by an interior trim 12 of a vehicle, a speaker grille 14 , a sound absorption sheet 16 , and a speaker 18 .
- the interior trim 12 is a resin board constructing an interior surface of a vehicle.
- the outline of the interior trim 12 is formed in accordance with the shape of a rear part of a back seat.
- Speaker openings 20 are formed on both sides of the interior trim 12 .
- the inner shape of the speaker opening 20 is formed in an almost square shape, but may be a circle shape or a triangle shape.
- the edge of the speaker opening 20 in the interior trim 12 is formed in a step pattern.
- a plurality of engaging holes 22 are formed in the step part of the speaker opening 20 , that is, around a recess 12 a.
- the speaker grille 14 is provided to protect the speaker 18 from an external shock and to improve the appearance.
- the speaker grille 14 has a ceiling board 14 a , a flange 14 b extended downward from the entire outer periphery of the ceiling board 14 a , and a sound guiding tube 32 having a cylindrical shape (the shape may be a cylinder, a rectangular cylinder, an elliptical cylinder, or the like), which are formed integrally.
- the speaker grille 14 is injection-molded using a synthetic resin, for example: PP (polypropylene); PE (polyethylene); PET (polyethylene terephthalate); PBT (polybutylene terephthalate); PVC (polyvinyl chloride); or ABS resin.
- a plurality of sound holes 24 which allow passages of the sound from the speaker 18 are formed at the ceiling board 14 a of the speaker grille 14 within the sound guiding tube 32 corresponding to the speaker 18 .
- a plurality of decorative blind holes 26 (or through holes) each having an inside diameter almost equal to that of the sound hole 24 are formed. Then, a visual effect can be produced as if the sound holes 24 are formed in the entire ceiling board 14 a of the speaker grille 14 .
- the sound guiding tube 32 for carrying sound efficiently from the speaker 18 is extended downward from the ceiling board 14 a of the speaker grille 14 so as to surround the sound holes 24 .
- the height of the sound guiding tube 32 is properly set so that the lower end of the sound guiding tube 32 is positioned near the speaker 18 so as to surround the speaker 18 when the speaker grille 14 is attached to the interior trim 12 (refer to FIG. 3 ).
- a plurality of hooks 30 (twelve hooks in the embodiment, so as to match the number of engaging holes 22 ) to be engaged with the corresponding engaging holes 22 in the interior trim 12 are extended downward from the speaker grille 14 .
- each of the hooks 30 is extended downward integrally from the flange 14 b of the speaker grille 14 .
- the shape of the speaker grille 14 (the outer periphery of the flange 14 b ) is formed in accordance with the shape of the recess 12 a as a step part of the interior trim 12 .
- the sound absorption sheet 16 is made of non-woven fabric.
- the size of the sound absorption sheet 16 is set to be larger than that of the speaker grille 14 so as to be able to cover the space X formed by the flange 14 b of the speaker grille 14 and the sound guiding tube 32 .
- a sound guiding tube insertion hole 34 (refer to FIG. 1 ) is formed at a position corresponding to the sound guiding tube 32 of the speaker grille 14 .
- a plurality of hooks insertion holes 36 (in the embodiment, twelve hook insertion holes 36 so as to match the number of hooks 30 ) for inserting the hooks 30 are formed at positions corresponding to the hooks 30 .
- the thickness of the sound absorption sheet 16 is set in the range of 0.5 to 1.0 mm in consideration of the strength and the allowance between the speaker grille 14 and the interior trim 12 for attaching (in the embodiment, the thickness of the sound absorption sheet 16 is set to 0.5 mm).
- the reason that the lower limit of the thickness of the sound absorption sheet 16 is set to 0.5 mm is to keep the strength of the sound absorption sheet 16 itself retaining.
- the reason that the upper limit of the thickness of the sound absorption sheet 16 is set to 1.0 mm is to keep the allowance between the speaker grille 14 and the interior trim 12 for attaching the speaker grille 14 to the interior trim 12 .
- the reason for selecting no-woven fabric as the material of the sound absorption sheet 16 is that innumerable fine openings are opened in the surface of non-woven fabric and communicate with a number of “voids S” in that. Vibration generated from the speaker grille 14 and transmitted to the sound absorption sheet 16 is converted to heat energy by “frictional resistance in the void S” and “resonance in the void S” and efficiently absorbed.
- the material of the sound absorption sheet 16 is not limited to non-woven fabric but any material can be used as long as it has a number of “voids” in that and has the sound absorption effect produced by the “voids”.
- woven fabric or a resin foamed sheet having interconnecting cells or closed cells in such case, innumerable fine openings are not formed in the surface but a number of “voids” exist on the inside of a surface layer and have the sound absorption effect
- woven fabric or a resin foamed sheet having interconnecting cells or closed cells in such case, innumerable fine openings are not formed in the surface but a number of “voids” exist on the inside of a surface layer and have the sound absorption effect
- the hooks 30 of the speaker grille 14 is inserted into the hook insertion holes 36 in the sound absorption sheet 16 .
- the sound guiding tube 32 of the speaker grille 14 is fitted in the sound guiding tube insertion hole 34 in the sound absorption sheet 16 , and the attachment of the sound absorption sheet 16 to the speaker grille 14 is completed.
- the sound guiding tube insertion hole 34 in the sound absorption sheet 16 is not fixed to the speaker grille 14 but is free.
- the hooks 30 of the speaker grille 14 inserted into the hook insertion holes 36 in the sound absorption sheet 16 are engaged with the engaging holes 22 formed in the recess 12 a of the interior trim 12 .
- the flange 14 b of the speaker grille 14 is fitted in the recess 12 a as the step part in the interior trim 12 , and the sound absorption sheet 16 is pinched between the flange 14 b of the speaker grille 14 and the interior trim 12 in a portion other than the hook 30 , thereby completing assembly of the noise suppression structure 10 .
- the speaker grille 14 is vibrated with the sound.
- the sound absorption sheet 16 is pinched between the portion other than the hook 30 of the speaker grille 14 (the flange 14 b ) and the interior trim 12 .
- the speaker grille 14 and the interior trim 12 are not in direct contact with each other. Even if the speaker grille 14 vibrates, therefore, friction noise is not generated between the flange 14 b and the interior trim 12 .
- the hook 30 is directly in engagement and contact with the engaging hole 22 .
- the sound absorption sheet 16 is made of non-woven fabric in which innumerable “voids S” exist. The sound reached to the sound absorption sheet 16 , therefore, is converted to heat energy by “frictional resistance in the void S” and “resonance in the void S” and absorbed. Moreover, the sound guiding tube insertion hole 34 in the sound absorption sheet 16 is not fixed but is free.
- the sound absorption sheet 16 is a plane sheet which periphery is pinched and having a large hole in its center.
- the sound absorption sheet 16 therefore, does not easily resonate with sounds at all frequencies from low to high and effectively absorbs the sounds with the above-described mechanism.
- vibration sound generated by vibration of the speaker grille 14 propagates in the space X and is absorbed by the sound absorption sheet 16 . That means reverberation causing another noise is not generated in the space X.
- the noise suppression structure 10 For assembling the noise suppression structure 10 , it is sufficient to cover the opening of the space X between the flange 14 b of the speaker grille 14 and the sound guiding tube 32 with the sound absorption sheet 16 and attach the speaker grille 14 in which the opening of the space X is covered with the sound absorption sheet 16 to the interior trim 12 .
- the assembly is simple and reliable. Consequently, work variations among workers do not occur for assembling the noise suppression structure 10 .
- the adhesive material conventionally used for attaching the sound absorption sheet 16 is not necessary. Thus, hazardous materials such as VOC are not diffused in a vehicle compartment space.
Abstract
Description
Claims (3)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007213784A JP4901641B2 (en) | 2007-08-20 | 2007-08-20 | Anti-noise structure |
JP2007-213784 | 2007-08-20 | ||
JP2007213784 | 2007-08-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090050402A1 US20090050402A1 (en) | 2009-02-26 |
US7677353B2 true US7677353B2 (en) | 2010-03-16 |
Family
ID=40381108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/193,310 Expired - Fee Related US7677353B2 (en) | 2007-08-20 | 2008-08-18 | Noise suppression structure |
Country Status (2)
Country | Link |
---|---|
US (1) | US7677353B2 (en) |
JP (1) | JP4901641B2 (en) |
Cited By (9)
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US20100259891A1 (en) * | 2009-04-14 | 2010-10-14 | Fujitsu Limited | Electronic device |
US20100282536A1 (en) * | 2007-10-19 | 2010-11-11 | Nissan Technical Center North America, Inc. | Apparatus and Method for Attaching Covering Material to Interior Components of a Vehicle |
US20120121924A1 (en) * | 2010-11-17 | 2012-05-17 | Oakwood Metal Fabricating Company | Speaker cover |
US20140233786A1 (en) * | 2013-02-20 | 2014-08-21 | Sound Sources Technology, Inc. | Grille attachment for loudspeaker |
US20150139475A1 (en) * | 2013-11-20 | 2015-05-21 | Kai Shuai Industrial Co., Ltd. | Speaker decorative rim mounting structure |
US9118405B2 (en) | 2012-03-02 | 2015-08-25 | Alberto CORNEJO LIZARRALDE | Sound suppression system and controlled generation of same at a distance |
US20150283948A1 (en) * | 2014-04-08 | 2015-10-08 | Toyota Motor Engineering & Manufacturing North America, Inc. | Packaging tray having integrated noise and vibration reduction features |
CN106851494A (en) * | 2015-11-26 | 2017-06-13 | 现代自动车株式会社 | Apparatus and method for controlling the loudspeaker grid in vehicle |
US11178476B2 (en) * | 2017-12-08 | 2021-11-16 | Goertek Inc. | Microphone module |
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JP5425535B2 (en) * | 2009-06-16 | 2014-02-26 | 日東電工株式会社 | Anti-noise sheet |
JP4865052B2 (en) * | 2010-04-20 | 2012-02-01 | 株式会社東芝 | Electronics |
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FI127222B (en) | 2013-06-14 | 2018-01-31 | Genelec Oy | Speaker with waveguide |
US10133314B2 (en) | 2014-05-26 | 2018-11-20 | Apple Inc. | Portable computing system |
US10228721B2 (en) * | 2014-05-26 | 2019-03-12 | Apple Inc. | Portable computing system |
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US10162390B2 (en) | 2015-01-16 | 2018-12-25 | Apple Inc. | Hybrid acoustic EMI foam for use in a personal computer |
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KR102148293B1 (en) * | 2018-11-28 | 2020-08-26 | 주식회사 서연이화 | console arm rest |
US11095974B1 (en) | 2020-02-13 | 2021-08-17 | Harman International Industries, Incorporated | External noise control for a loudspeaker |
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US9118405B2 (en) | 2012-03-02 | 2015-08-25 | Alberto CORNEJO LIZARRALDE | Sound suppression system and controlled generation of same at a distance |
US20140233786A1 (en) * | 2013-02-20 | 2014-08-21 | Sound Sources Technology, Inc. | Grille attachment for loudspeaker |
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US20150283948A1 (en) * | 2014-04-08 | 2015-10-08 | Toyota Motor Engineering & Manufacturing North America, Inc. | Packaging tray having integrated noise and vibration reduction features |
US9248781B2 (en) * | 2014-04-08 | 2016-02-02 | Toyota Motor Engineering & Manufacturing North America, Inc. | Packaging tray having integrated noise and vibration reduction features |
CN106851494A (en) * | 2015-11-26 | 2017-06-13 | 现代自动车株式会社 | Apparatus and method for controlling the loudspeaker grid in vehicle |
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US11178476B2 (en) * | 2017-12-08 | 2021-11-16 | Goertek Inc. | Microphone module |
Also Published As
Publication number | Publication date |
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US20090050402A1 (en) | 2009-02-26 |
JP4901641B2 (en) | 2012-03-21 |
JP2009046009A (en) | 2009-03-05 |
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